
# def abso(x):
#     '''
#     计算并返回一个绝对值
#     :return:
#     '''
#
#     if x >= 0 :
#         return x
#     else:
#         return -x
#
#
# print(abso(-7) +1)

def info(name, age ,gender = 'nan'):
    return 'haha'
    print('姓名：',name)
    print('年龄：',age)
    print('性别：',gender)

result = info(age = 20 , name = 'jack')
print(result)  # None = 空的
